[Bug 21888] [Custom]: #dfn-custom-element-definition should be defined, and maybe registering a type extension of a custom tag should become an error?

https://www.w3.org/Bugs/Public/show_bug.cgi?id=21888

--- Comment #3 from Dominic Cooney <dominicc@chromium.org> ---
(In reply to comment #1)
> (In reply to comment #0)
> I don't see where there's ambiguity. You simply can't use "is" with a custom
> tag. Can you help me understand better where the problem is?

Let me try again--sorry that was a bit of a ramble.

I think I was confused by the document.register steps.

If an author writes this code:

1: var A = document.register('x-a');
2: var B = document.register('x-b', {prototype: Object.create(A.prototype)});

Then on line 2, after register step 5.2, is INTERFACE going to be A or
HTMLElement?

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Received on Wednesday, 8 May 2013 00:06:32 UTC